I respectfully disagree with troutbert. If you are hiking into a stream more than a mile from access points, you will do very little, if any, harm to the stream if you take a handful of wild trout for your campfire. Now if you are going with a small group, I think it would be recommended to only take an aggregate of 4-5 fish from any particular half-mile stretch of water. Harvest only really becomes problematic when your small handful of fish are multiplied by a dozen anglers doing the same within a season. I don't think this multiplication effect will be at work if you've hiked in a substantial distance from access. If you are unsure, keep every 4th or 5th fish, just to be sure you aren't cleaning out the reproducing population. Also, if the trip is to take place soon, you may be interfering with mating, so be a little extra careful.